3/8" X 24
 
Fits our king pins.
 
Threads are molded into the nylon insert locking the bolt into place. Nylon Insert Jam Lock Nuts typically have a cased metal outside formed into a hex pattern easily torqued by a wrench or socket; Jam Lock Nuts feature a thin pattern profile. Type NTE Grade A. ASME B1.1 UNC and UNF Class 2B thread requirement. Black Oxide plating, retards the corrosion rate in a normal atmosphere.